Help for Meta-analysis

New Member

I am Farah, am new to this forum. I am a physician and my knowledge of stats is limited. We are conducting a meta-analysis and exploring the relationship between obesity (BMI) and mortality. The reference group we set is normal weight, whereas some studies included in the meta-analysis use obese/overweight group as reference. For example this one study is using obese group as reference and the factitious data is as under:

Not a robit

Are all studies reporting RRs? ORs are invertible, meaning A vs B can be converted to B vs A by calculating 1/(A vs B).

Also, In am not sure of the setting you are looking at for this MA, but BMI predicting Mortality is the biggest culprit of collider stratification bias and paradoxical results (e.g., health weight more predictive of mortality).